Cheeper Keeper Automatic Chicken Coop Door Opener NO ELECTRICAL OUTLET NEEDED--No cords--No complicated wiring--Automatic Opens at dawn, closes at dusk--Runs on 4 AA batteries will last for years. Timer is sold separately (part BS-D), so you can mount it away from the main unit Weatherproof Unit has all a quiet steel geared motor--Polished Aluminum Door is 8.5" x 13" and aluminum rails, NOT WOOD RAILS, as wood warps, rots, ruins over time. Units will last decades. Larger sizes available under "Chicken/Duck Door" or "Goose Door" NOTE: Cord is rated at 60lbs, and has been successfully used around the world for 30 years 30 year reliable track record in chicken coop door openers using AXT-Electronic components--overload safety device, auto motor-stop if door is blocked to allow chickens to pass through for up to 3 minutes--Equipped with extremely rugged housings, seals and UV protection, SMT is triple varnished--resists dust, dirt, moisture, UV, ammonia gases, lightning strike proof and impact resistant For Outdoor installation ONLY, NO NEED FOR PROGRAMMING, but it does have an adjustable light sensor setting (or for indoors use our AS Outside Light Sensor or for programmable timer add the BS-D Digital Timer), Complete Instructions, video installation, diagrams Complete Kit Includes Everything You Need--Made in Germany, 100% Recyclable Packaging--English Manual--Some Assembly Req'd--Needs at least 10" wide x 34" height